WordPress 3.5 Media Uploader – Only allow 1 upload and certain file types

2 comments

1. The file types that you have specified ‘application/msword’, ‘application/vnd.ms-excel’, ‘application/pdf’ are already supported by media uploader.

   To see the default supported mime file types, call wp_get_mime_types() function.

   Use upload_mimes filter as shown in following code to make media uploader to accept files types other than the default.

   Add following code in your themes functions.php file

   // Add the filter
   add_filter('upload_mimes', 'custom_upload_mimes');
   
   function custom_upload_mimes ( $existing_mimes=array() ) {
   
   // Add file extension 'extension' with mime type 'mime/type'
   $existing_mimes['prc'] = 'application/x-mobipocket'; 
   
   // and return the new full result
   return $existing_mimes; 
   }
   

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2. Like Vinod Dalvi said, you could use the filter upload_mimes to achieve what you need.
   You can deregister existing mimes types using

   unset($mime_types['pdf']);
   

   and adding new type by adding then to the array :

   $mime_types['avi'] = 'video/avi';
   

   for instance

   function my_myme_types($mime_types){
       $mime_types['avi'] = 'video/avi'; //Adding avi extension
       unset($mime_types['pdf']); //Removing the pdf extension
       return $mime_types;
   }
   add_filter('upload_mimes', 'my_myme_types', 1, 1);
   

   This is taken from here

   You say :

   how do i limit the mime types to only the selected mime types for that
   specific instance of the media upload? I don’t want to limit the
   standard WP Editor upload to those same mime types

   Do you mean limiting mime type only for one type of uploader ? I can’t see the logic involved, since if there are other “instances” of media uploader, “forbidden” media types could be uploaded anyway.

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